JPS5941528A - Caisson - Google Patents

Abstract

PURPOSE:To permit the setting of a caisson even when oceanic weather condition is adverse by a method in which a box-shaped caisson is divided into plural small compartments by partition walls, and plural openings are provided in the side walls to connect the small compartments to the outside. CONSTITUTION:Small compartments 12 having plural partition walls 11 crossing each other in the longitudinal direction are formed in the inside of an upside- opened box caisson of steel or concrete. Square openings 14 are formed in the left and right-handed side walls 13 of each small compartment 12 of the body 10 to connect the inside and outside of them, and the lower edges of the openings 14 are positioned above the draft line of the body 10 in such a way as to cause the body 10 to float. Frame supporters 15 are also provided to the peripheral edges of the openings 14 and connected with block parts 16 of steel sheet piles, etc. The body 10 is towed to construction site, water is charged into the body 10 to cause it to settle to the seabed 18, the block parts 16 are coupled and closed, and weight parts 17 are charged to complete the setting of the caisson.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a caisson used for installing extensions, quays, artificial islands, etc.

Conventionally, this type of caisson consists of a concrete block shaped like a deer box, about 30 m square at most.The box-shaped block is floated on the sea and transported to the site by towing or crane boat, and then submerged by water injection. After this, earth and sand was poured into the interior to bring it to the specified weight, and once it was completed, the caisson of fire was towed in the same way and placed adjacent to it, and earth and sand was poured into this as well, and construction was continued one after another.

However, because conventional caissons are completely box-shaped, they are susceptible to the effects of waves and ocean currents (and if a large wave occurs while soil is being poured in, the caissons may slip or fall over). Therefore, during installation, it is necessary to select the sea conditions and introduce soil in a short period of time.Also, due to the relationship between the soil input capacity and the size of the caisson, it is not possible to increase the size of the caisson. make several small caissons,
The construction method involved lining up these pieces one after another on the seabed.

Incidentally, in recent years, caisson installations have become increasingly common in deep seas far from land and in poor sea conditions. This has resulted in the inconvenience of extending the period and increasing costs. In addition, when constructing quays overseas, the cost of transporting small caisson from Japan is excessive, and on the other hand, if the caisson is manufactured locally, depending on the construction location, it may be necessary to The disadvantage is that it must be made from scratch, and in any case it is expensive.

An object of the present invention is to provide a caisson that can be installed even in bad sea conditions such as rough seas.

The present invention provides a plurality of partition walls in a box-shaped caisson main body to divide the caisson main body into a plurality of small chambers, and also forms an opening on the side of the caisson main body to communicate the inside and outside of the caisson main body. When the caisson main l is injected with water and sinks, seawater is allowed to flow through the 1140 mentioned above to prevent the caisson from falling over due to waves under bad sea conditions, and then one of the caisson openings is selected and this opening is closed with a steel bar, etc. By gradually throwing stones into the interior while blocking it with appropriate means, 1110 is then closed while securing the necessary weight to prevent it from tipping over or slipping even in stormy weather, and then closing the last opening. An embodiment of the present invention will now be described with reference to the drawings.

An upwardly open box-shaped caisson body 10 made of steel or concrete is provided with a plurality of, for example, three, partition walls 11 in a direction perpendicular to its longitudinal direction, and four small chambers 12 are formed in these partition walls 11. has been done. At this time, when each small chamber 12 is to be distinguished and referred to by the reference numeral 12A from the front in FIG.

12B, 12C, and 12D, and when the whole is shown, it is simply shown as 12. Further, one rectangular opening 14 is formed for each small chamber 12 in the left and right side walls 13 along the longitudinal direction of the caisson main body IQ, and the inside and outside of the caisson main body 1o are communicated through these openings 14. . Further, the lower edges of these openings 14 are formed so as to be located above the water line of the caisson body 10, so that the caisson body 10 can float on the sea (water).

In the left and right side walls 13, frame-shaped support members 15 are provided at the peripheral edges of each opening 14, and these support members 15 are open at the top and have a bottom 15A formed at the bottom, and An opening 15B is formed on the side surface at a position opposite to the opening 14. Also,
A closing member 16 made of steel sheet piles can be fitted into the supporting member 15 from the open portion above MiJ, and the opening 14 can be closed by fitting the closing member 16 to the supporting member 15. It looks like this.

In the figure, reference numeral 17 indicates a heavy member such as stone that is inserted into the caisson body 10, and reference numeral 18 indicates the seabed.

Next, the installation method of this embodiment will be explained.

The caisson body 10 is towed and transported to the site without a heavy member 17 such as stone being thrown inside, and here water is poured into the caisson body 10 to sink it, and the caisson body 10 is installed on the seabed 18. At this time, y8f1014 is formed in the caisson main body 10, and an opening 15B is also formed in the support member 15, and these openings 14 and 15B are open, so that the caisson that is bottomed out The main body 10 is hardly subjected to wave pressure and does not fall over or move.

Next, a support member 15 provided around the opening 14 of one of the small chambers 120 in the caisson main body 10, for example, the small chamber 12A.
When the inner trap closing member 16 is fitted and closed, and the heavy member 17 such as stone is thrown into the caisson body 10 so that the overall weight reaches the required value, the same operation is performed on the next chamber 12B. Furthermore, the same work is carried out in order for the chambers 12C and 12D to complete the work of erecting the caissons on the seabed.

According to this embodiment as described above, the operation of the opening 14 allows the caisson to move safely and efficiently even in the sea where the water depth is large and the sea conditions are poor. 1. Unlike conventional construction methods, there is no need to construct a large number of caissons whose capacity is balanced with the input amount of heavy components 170, such as stone, so the establishment of caissons has nothing to do with the imbalance in the supply of heavy components 17. Therefore, the caisson body 10 of the present invention can be constructed one after another in a half-finished state regardless of the heavy component supply capacity, and the construction efficiency can be improved. , width 30m
It can be formed to a relatively large size, and therefore, it is economically viable even if it is transported far away by sea by sea, and as mentioned above, there is no need to insert the heavy members 17 at once.
Construction can be carried out even in areas where it is difficult to secure a large amount of heavy members 17.

In carrying out the present invention, the supporting member 15 and the closing member 16 may have other shapes and structures, for example, a structure in which a concrete plate is used as the closing base member 16 to close the opening 14. In short, the caisson main body 10 After pouring water into the opening 1
Any structure may be used as long as the structure can close 4 with sufficient strength. I cut it,
The weight member 17 is not limited to stone, and may be made of sand or the like. Further, the size of the caisson body jO is not limited to the above-mentioned specific dimensions, but may be other dimensions, and the number of partition walls 11 is not limited to the above-mentioned number, but may be two or four or more. Furthermore, the opening 14 is not limited to one provided corresponding to each of the small chambers 12A to 12D, but may span adjacent small chambers 12, or one
Although there may be two or more in each small chamber 12, and some may not be provided in some of the small chambers 12, the structure of the above embodiment is preferable.

As described above, the present invention has the effect of providing a caisson that can be established even under adverse sea conditions.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing one embodiment of the present invention, Fig. 2 is an enlarged sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is an enlarged sectional view taken along the line T'' in Fig. 2. It is. 10... Caisson body, 11... Bulkhead, 12.12
A. 12B, 12C, 12D...small chamber, 13...side wall,
14... Opening, 15... Supporting member, 16... Closing member, 17... Weight member. Agent: Patent attorney Minoru Kinoshita (and 1 other person)

Claims (1)

[Claims] (11 A plurality of partition walls are provided in the caisson body formed in a box shape to divide the caisson body into a number of small chambers,
A caisson characterized in that a plurality of openings are formed on the side of the caisson body to communicate the inside and outside of the caisson body. (2) The caisson according to claim 1, wherein the opening is provided with an attachment support member that can close the opening.